Filter



FIG. 1 is a front view of the filter showing my new design;

FIG. 2 is a left side view;

FIG. 3 is a right side view;

FIG. 4 is a rear view;

FIG. 5 is a top view;

FIG. 6 is a bottom view; and,

FIG. 7 is a perspective view of the front and bottom of the filter. 

The ornamental design for a filter, as shown and described. 